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Aphidinae : Macrosiphini : Aulacorthum muradachi
 

 

Aulacorthum muradachi

Crimson-stained lindera aphid

On this page: Identification & Distribution Other aphids on the same host

Identification & Distribution

Adult apterae of Aulacorthum muradachi have a brown head and prothorax. The abdomen is milky white, pale yellow or pale green, with conspicuous dorsal pigmentation consisting of paired submarginal rows of red to reddish-brown patches from the mesonotum to abdominal tergites VI, which converge and broaden-out at the bases of the siphunculi (cf. Aulacorthum linderae, which has brown or red patches around the bases of the siphunculi and sometimes on tergites I/II). The antennae are 1.8-1.9 times as long as the body. Antennal segments I & II are dark, III-V are pale with dark apices. Segment VI has a pale base and a dark terminal process, which is about five or six times as long as the base. The antennal tubercles are high, diverging at the inner sides. The apical rostral segment (RIV+V) is 0.9-1.0 times as long as the second hind tarsal segment (HTII) (cf. Aulacorthum linderae, which has RIV+V 1.2-1.4 times the length of HTII). The legs are very long, pale yellowish brown, with the apical half of the femora, both ends of the tibiae and the tarsi black. The siphunculi are 2.5-3 times as long as the short pale cauda, and are completely black (cf. Aulacorthum linderae, which has the siphunculi pale or dark only at the apices). The body length of adult Aulacorthum muradachi apterae is 1.6-2.6 mm.

Images above by permission, copyright Akihide Koguchi, all rights reserved.

The alate Aulacorthum muradachi (see picture below) is similar to the aptera with completely black siphunculi, but in addition has rather faint dorsal bands on the abdomen, especially on the posterior part. The antennae have 8-11 secondary rhinaria on segment III. Immatures (see pictures above and below) have similar dorsal pigmentation to the apterae, but the paired submarginal rows of patches are pale orange.

Image above by permission, copyright Akihide Koguchi, all rights reserved.

Aulacorthum muradachi is found on the leaves of spicewood, Lindera species (Lauraceae), especially Lindera erythrocarpa, abrachan (Lindera praecox), Lindera triloba, and kuro moji (Lindera umbellata). As far as is known, the species is monoecious holocyclic. It is distributed through Japan and Korea.

 

Other aphids on the same host

Aulacorthum muradachi has been found on 4 species of Lindera (Lindera erythrocarpa, Lindera praecox, Lindera triloba, Lindera umbellata).

Acknowledgements

We are especially grateful to Akihide Koguchi for allowing us to reproduce the image of Aulacorthum muradachi from his blog page, and to Daisuke Sasaki who confirmed the identification.

We have used the keys and species accounts from Takahashi (1965) and Miyakazi (1971) along with information from Roger Blackman & Victor Eastop in Aphids on Worlds Plants. We fully acknowledge these authors as the source for the (summarized) taxonomic information we have presented. Any errors in identification or information are ours alone, and we would be very grateful for any corrections. For assistance on the terms used for aphid morphology we suggest the figure provided by Blackman & Eastop (2006).

Useful weblinks

References

  • Miyakazi, M. (1971). A revision of the tribe Macrosiphini of Japan (Homoptera: Aphididae, Aphidinae). Insect matsumurana 34(1), 1-247 Full text

  • Takahashi, (1971). Some species of Aulacorthum of Japan (Aphididae, Homoptera). Insect matsumurana 27(2), 99-113 Full text